EP1240875A1 - Spinal anchor with locking collar - Google Patents

Spinal anchor with locking collar Download PDF

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Publication number
EP1240875A1
EP1240875A1 EP02290631A EP02290631A EP1240875A1 EP 1240875 A1 EP1240875 A1 EP 1240875A1 EP 02290631 A EP02290631 A EP 02290631A EP 02290631 A EP02290631 A EP 02290631A EP 1240875 A1 EP1240875 A1 EP 1240875A1
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EP
European Patent Office
Prior art keywords
ring
assembly according
connector
anchoring means
connecting member
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP02290631A
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German (de)
French (fr)
Other versions
EP1240875B1 (en
Inventor
Pierre Henri Saint Martin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Stryker Spine SAS
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Stryker Spine SAS
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Publication date
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Publication of EP1240875A1 publication Critical patent/EP1240875A1/en
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Publication of EP1240875B1 publication Critical patent/EP1240875B1/en
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Classifications

    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
    • A61B17/7002—Longitudinal elements, e.g. rods
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
    • A61B17/7035—Screws or hooks, wherein a rod-clamping part and a bone-anchoring part can pivot relative to each other
    • A61B17/7037—Screws or hooks, wherein a rod-clamping part and a bone-anchoring part can pivot relative to each other wherein pivoting is blocked when the rod is clamped
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
    • A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
    • A61B17/70—Spinal positioners or stabilisers ; Bone stabilisers comprising fluid filler in an implant
    • A61B17/7001—Screws or hooks combined with longitudinal elements which do not contact vertebrae
    • A61B17/7032—Screws or hooks with U-shaped head or back through which longitudinal rods pass

Definitions

  • the invention relates to osteosynthesis systems, especially for spine surgery.
  • WO 98/12 976 presents a system spinal osteosynthesis comprising an anchoring member polyaxial screw type whose locking in position is carried out by pressing the connecting rod on a crown whose rounded bottom surface comes in additional support on the spherical head of the bone screw housed in the bottom of a fitted accommodation in a connector.
  • Such a system requires effort very important support of the stem on the crown to that the surface pressure between the crown and the head of screws is sufficient to avoid any movement of one in relation to the other, a movement which would have consequence of creating a harmful instability to the osteosynthesis sought.
  • An object of the invention is to provide a device blocking in safer position, for the same effort of Tightening.
  • a spinal osteosynthesis assembly comprising a connector, bone anchoring means capable of being received in the connector, a connecting member capable of being received in the connector, and a ring. able to come into contact with the head, the connecting member being able to come to bear simultaneously on the ring and the head when the ring and the anchoring means are mounted in the connector.
  • the ring has at least one conical face.
  • the ring has a face capable of come into contact with the anchoring means.
  • the ring has a face capable of come into contact with a wall of the connector.
  • the faces are coaxial.
  • the ring has an edge upper plane, perpendicular to an axis of the ring and able to come into contact with the connecting member.
  • the ring has an edge lower plane, perpendicular to an axis of the ring.
  • the ring is able to extend between the wall and the anchoring means when the member of connection carries out said support.
  • the ring is deformed when the liaison body performs said support, with reference to a shape of the ring before mounting.
  • the ring has a wall thickness which varies according to a height.
  • the ring has a wedge-shaped section which, when the system is locked, will simply get stuck between the wall of the connector and the anchoring means, which, in a simple way, will further reinforce the locking in position.
  • the ring includes a slot.
  • the slot is arranged so that the ring forms an unclosed ring.
  • the ring comprises a plurality of slots evenly distributed over a circumference of the ring.
  • the anchoring means comprise a head having a substantially spherical face.
  • the head has first and second spherical faces with the same center and diameters significantly different.
  • the anchoring means form a polyaxial screw.
  • the assembly includes a suitable lock to come to bear on the connecting member.
  • osteosynthesis comprising a set presenting at minus one of the above characteristics.
  • the assembly for osteosynthesis of the spine 1 here comprises a connector 2, a connecting member 6 and anchoring means 4.
  • the connecting member 6 is an osteosynthesis rod and the anchoring means 4 are formed by a screw pedicular.
  • the assembly 1 further comprises a ring 8 as well as a lock 10 capable of locking the assembly 1 in position.
  • Connector 2 has an opening called “U” 21 forming the upper part of connector 2.
  • This “U” opening 21 is delimited by two branches 25 and 26 which extend substantially parallel to each other.
  • the faces internal branches 25 and 26 which extend opposite one of the other have a thread 24.
  • connector 2 in its lower part, comprises an internal housing 22 having a wall 23.
  • the upper part of the internal housing 22 opens in the bottom of the “U” opening 21, and its part bottom opens in opposite way on one side lower 27 of connector 2.
  • the wall 23 has a conical section arranged in such a way that the opening at the level of the underside 27 is smaller than the opening at level of the bottom of the U-shaped opening 21.
  • the latch 10 comprises means of implementation 11 which appear here in the form of an orifice crossing 11 having a hexagonal imprint. This hexagonal footprint is suitable for receiving a tip hexagonal adapted from a screwdriver for its implementation.
  • the latch 10 comprises on its wall lateral external thread 12 complementary to the thread 24 of connector 2 between branches 25 and 26 from which he is fit to be received.
  • the anchoring means 4 are presented here under the shape of a pedicle screw comprising a part anchor 41 having a bone thread, surmounted a head 42 which is here substantially spherical.
  • the head 42 has a first spherical surface 43 and, forming the apex, a second spherical surface 44 of which the diameter is less than the diameter of the surface spherical 43 but with the same center as this one.
  • the ring 8 is of annular shape and has a first face 82 delimiting the internal wall of the ring, a second face 81 delimiting the external wall of the ring as well as the upper edges 83 and lower 84 perpendicular to the axis of revolution geometric A of the ring 8.
  • the faces 81 and 82 are coaxial and preferably conical. Their respective generators are not parallel between they. Thus, the faces are arranged one with respect to the other so that the thickness of the ring 2 at the upper edge 83 is greater than the thickness of the ring 8 at the lower edge 84.
  • the section of the ring thus presents a form of corner, giving a beveled shape of the ring 8.
  • one of the generators of faces 81 and 82 can be substantially parallel to the axis of revolution AT.
  • the connector 2 Before use by a surgeon, the connector 2, the anchoring means 4 and the ring 8 are mounted together.
  • the head 42 of the anchoring means is inserted within the internal housing 22 of connector 2.
  • the ring 8 is itself inserted within the internal housing 22 of the connector 2.
  • the head 42 anchoring means 4 is held captive at within the internal housing 22 against its exit from above, due to the presence within the accommodation internal 22 of ring 8, itself held captive as we will see later.
  • Head 42 is retained at against its exit from the bottom, due to the presence of the conical section of the wall 23 of the internal housing 22, which has an opening at the level of the lower face 27 of the connector 2, the dimensions are less than the diameter of the surface 43 of the head 42.
  • the ring 8 is retained prisoner by means of restraint 28 present at the within the internal housing 22.
  • the retaining means 28 come from the difference in dimension between the internal housing 22 and the U-shaped opening 21, difference forming a rim on which abuts from below the upper edge 83 of the ring 8. This assembly is illustrated in Figures 4 and 5.
  • the surgeon places an assembly in the pedicle as described above. Then he sets up the connecting member 6 by inserting it into the “U” opening 21 of the connector 2. Then he sets up the latch 10 between the arms 25 and 26, engaging the thread 12 of the latch 10 with the complementary thread 24 of the connector 2. It implements, by the hexagonal imprint 11, the latch 10, so that the lower face 13 of the latch 10 comes into contact with the connecting member 6 . By continuing to screw the lock 10 between the arms 25 and 26, the surgeon will exert a force by the lock 10 on the connecting member 6, which will push the connecting member 6 until the latter comes to bear on the upper edge 83 of the ring 8.
  • the ring 8 then slides along the wall 23 of the internal housing 22 until the face 82 of the ring 8 comes into contact with the surface 43 of the head 42 of the anchoring means 4.
  • the surface 43 is itself in contact with the conical section of the wall 23 of the internal housing 22 of the connector 2.
  • the clamping force imposed by the surgeon via the lock 10 will allow the ring 8 to slide on the head 42.
  • the face 82 will slide on the surface 43, forcing the ring 8 to open by deformation until the face 81 of the ring 8 comes into contact over all or part of its surface with the wall 23 of the internal housing 22 of the connector 2.
  • the connecting member 6 comes to bear at a point on the spherical surface 44.
  • the head 42 is locked in position, on the one hand by the ring 8 and on the other hand, by the connecting member 6 directly.
  • the ring 8 may include at least one slot.
  • the slot can be arranged so that the ring forms an unclosed ring.
  • the bevel shape due to the wedge shape of the section of the ring may consist of a plurality of sectors separated by slots to form a structure called "umbrella" .
  • These various modifications allow easier deformation of the ring 8. This has the consequence of facilitating the introduction of the ring 8 within the internal housing 22 of the connector 2, on the one hand, and, on the other hand, the locking final during use during surgery.

Abstract

The bone anchor screw has a connector (2) with bone anchor screw (4) received in the connector. A coupling shaft (6) is received in the connector and a sleeve ring (8) engages with the anchor screw. The shaft engages simultaneously with the sleeve ring and the anchor when the ring and anchor screw are mounted in the connector. The sleeve ring can be tapered.

Description

L'invention concerne les système d'ostéosynthèse, notamment pour la chirurgie de la colonne vertébrale.The invention relates to osteosynthesis systems, especially for spine surgery.

Le document WO 98/12 976 présente un système d'ostéosynthèse rachidien comprenant un organe d'ancrage de type vis polyaxiale dont le blocage en position s'effectue par appui de la tige de liaison sur une couronne dont la surface inférieure arrondie vient en appui de manière complémentaire sur la tête sphérique de la vis osseuse logée dans le fond d'un logement aménagé dans un connecteur. Un tel système nécessite un effort très important d'appui de la tige sur la couronne pour que la pression surfacique entre la couronne et la tête de vis soit suffisante pour éviter tout mouvement de l'un par rapport à l'autre, mouvement qui aurait pour conséquence de créer une instabilité néfaste à l'ostéosynthèse recherchée.WO 98/12 976 presents a system spinal osteosynthesis comprising an anchoring member polyaxial screw type whose locking in position is carried out by pressing the connecting rod on a crown whose rounded bottom surface comes in additional support on the spherical head of the bone screw housed in the bottom of a fitted accommodation in a connector. Such a system requires effort very important support of the stem on the crown to that the surface pressure between the crown and the head of screws is sufficient to avoid any movement of one in relation to the other, a movement which would have consequence of creating a harmful instability to the osteosynthesis sought.

Un but de l'invention est de fournir un dispositif de blocage en position plus sûr, pour un même effort de serrage.An object of the invention is to provide a device blocking in safer position, for the same effort of Tightening.

Pour cela, on prévoit, selon l'invention, un ensemble d'ostéosynthèse rachidienne comprenant un connecteur, des moyens d'ancrage osseux aptes à être reçus dans le connecteur, un organe de liaison apte à être reçu dans le connecteur, et une bague apte à venir en contact avec la tête, l'organe de liaison étant apte à venir en appui simultanément sur la bague et la tête lorsque la bague et les moyens d'ancrage sont montés dans le connecteur.
   Ainsi, lors du verrouillage du système d'ostéosynthèse, l'appui de l'organe de liaison sur la bague oblige cette dernière à venir appuyer sur les moyens d'ancrage pour bloquer les moyens d'ancrage en position au sein du connecteur, et l'appui simultané de l'organe de liaison sur les moyens d'ancrage vient renforcer le blocage précédent, ce qui le sécurise tout en conservant le même effort de serrage pour le verrouillage.For this, provision is made, according to the invention, for a spinal osteosynthesis assembly comprising a connector, bone anchoring means capable of being received in the connector, a connecting member capable of being received in the connector, and a ring. able to come into contact with the head, the connecting member being able to come to bear simultaneously on the ring and the head when the ring and the anchoring means are mounted in the connector.
Thus, when the osteosynthesis system is locked, pressing the connecting member on the ring forces the latter to come to press on the anchoring means to block the anchoring means in position within the connector, and the simultaneous support of the connecting member on the anchoring means reinforces the previous blocking, which secures it while retaining the same clamping force for locking.

Avantageusement, la bague présente au moins une face conique.Advantageously, the ring has at least one conical face.

Avantageusement, la bague présente une face apte à venir en contact avec les moyens d'ancrage.Advantageously, the ring has a face capable of come into contact with the anchoring means.

Avantageusement, la bague présente une face apte à venir en contact avec une paroi du connecteur.Advantageously, the ring has a face capable of come into contact with a wall of the connector.

Avantageusement, les faces sont coaxiales.Advantageously, the faces are coaxial.

Avantageusement, la bague présente un bord supérieur plan, perpendiculaire à un axe de la bague et apte à venir en contact avec l'organe de liaison.Advantageously, the ring has an edge upper plane, perpendicular to an axis of the ring and able to come into contact with the connecting member.

Avantageusement, la bague présente un bord inférieur plan, perpendiculaire à un axe de la bague.Advantageously, the ring has an edge lower plane, perpendicular to an axis of the ring.

Avantageusement, la bague est apte à s'étendre entre la paroi et les moyens d'ancrage lorsque l'organe de liaison réalise ledit appui.Advantageously, the ring is able to extend between the wall and the anchoring means when the member of connection carries out said support.

Avantageusement, la bague est déformée lorsque l'organe de liaison réalise ledit appui, par référence à une forme de la bague avant montage. Advantageously, the ring is deformed when the liaison body performs said support, with reference to a shape of the ring before mounting.

Avantageusement, la bague présente une épaisseur de paroi qui varie suivant une hauteur.
   Ainsi, la bague présente une section en forme de coin qui, lors du verrouillage du système, viendra se coincer simplement entre la paroi du connecteur et les moyens d'ancrage, ce qui, de manière simple, renforcera encore plus le blocage en position.Advantageously, the ring has a wall thickness which varies according to a height.
Thus, the ring has a wedge-shaped section which, when the system is locked, will simply get stuck between the wall of the connector and the anchoring means, which, in a simple way, will further reinforce the locking in position.

Avantageusement, la bague comprend une fente.Advantageously, the ring includes a slot.

Avantageusement, la fente est agencée de sorte que la bague forme un anneau non fermé.Advantageously, the slot is arranged so that the ring forms an unclosed ring.

Avantageusement, la bague comprend une pluralité de fentes uniformément réparties sur une circonférence de la bague.Advantageously, the ring comprises a plurality of slots evenly distributed over a circumference of the ring.

Avantageusement, les moyens d'ancrage comprennent une tête présentant une face sensiblement sphérique.Advantageously, the anchoring means comprise a head having a substantially spherical face.

Avantageusement, la tête présente des première et seconde faces sphériques de même centre et de diamètres sensiblement différents.Advantageously, the head has first and second spherical faces with the same center and diameters significantly different.

Avantageusement, les moyens d'ancrage forment une vis polyaxiale.Advantageously, the anchoring means form a polyaxial screw.

Avantageusement, l'ensemble comporte un verrou apte à venir en appui sur l'organe de liaison. Advantageously, the assembly includes a suitable lock to come to bear on the connecting member.

On prévoit aussi, selon l'invention, un système d'ostéosynthèse comprenant un ensemble présentant au moins l'une des caractéristiques précitées.According to the invention, a system is also provided. osteosynthesis comprising a set presenting at minus one of the above characteristics.

D'autres caractéristiques et avantages de l'invention apparaítront lors de la description suivante d'un mode préféré de réalisation. Aux dessins annexés :

  • la figure 1 est une vue en perspective du mode préféré de réalisation de l'invention ;
  • la figure 2 est une vue en coupe selon le plan II-II du mode de réalisation de la figure 1 ;
  • la figure 3 est une vue en perspective de la bague du mode de réalisation préféré ;
  • la figure 4 est une vue en perspective du mode de réalisation de la figure 1 avant la mise en place de l'organe de liaison ; et
  • la figure 5 est une vue en coupe selon le plan V-V du mode de réalisation de la figure 4.
Other characteristics and advantages of the invention will become apparent from the following description of a preferred embodiment. In the accompanying drawings:
  • Figure 1 is a perspective view of the preferred embodiment of the invention;
  • Figure 2 is a sectional view along the plane II-II of the embodiment of Figure 1;
  • Figure 3 is a perspective view of the ring of the preferred embodiment;
  • Figure 4 is a perspective view of the embodiment of Figure 1 before the establishment of the connecting member; and
  • FIG. 5 is a sectional view along the plane VV of the embodiment of FIG. 4.

En référence aux différentes figures 1 à 5, un mode préféré va être décrit. L'ensemble pour ostéosynthèse de la colonne vertébrale 1 comprend, ici, un connecteur 2, un organe de liaison 6 et des moyens d'ancrage 4. Ici, l'organe de liaison 6 est une tige d'ostéosynthèse et les moyens d'ancrage 4 sont formés par une vis pédiculaire. L'ensemble 1 comprend en outre une bague 8 ainsi qu'un verrou 10 apte à verrouiller l'ensemble 1 en position.With reference to the different figures 1 to 5, a mode preferred will be described. The assembly for osteosynthesis of the spine 1 here comprises a connector 2, a connecting member 6 and anchoring means 4. Here, the connecting member 6 is an osteosynthesis rod and the anchoring means 4 are formed by a screw pedicular. The assembly 1 further comprises a ring 8 as well as a lock 10 capable of locking the assembly 1 in position.

Le connecteur 2 comporte une ouverture dite en « U » 21 formant la partie supérieure du connecteur 2. Cette ouverture en « U » 21 est délimitée par deux branches 25 et 26 qui s'étendent de manière sensiblement parallèle l'une par rapport à l'autre. Les faces internes des branches 25 et 26 qui s'étendent en regard l'une de l'autre comportent un filetage 24. D'autre part, le connecteur 2, dans sa partie inférieure, comprend un logement interne 22 présentant une paroi 23. La partie supérieure du logement interne 22 débouche dans le fond de l'ouverture en « U » 21, et sa partie inférieure débouche de manière opposée sur une face inférieure 27 du connecteur 2. Du coté de la face inférieure 27, la paroi 23 présente une section conique agencée de manière à ce que l'ouverture au niveau de la face inférieure 27 soit plus petite que l'ouverture au niveau du fond de l'ouverture en « U » 21.Connector 2 has an opening called "U" 21 forming the upper part of connector 2. This “U” opening 21 is delimited by two branches 25 and 26 which extend substantially parallel to each other. The faces internal branches 25 and 26 which extend opposite one of the other have a thread 24. On the other part, connector 2, in its lower part, comprises an internal housing 22 having a wall 23. The upper part of the internal housing 22 opens in the bottom of the “U” opening 21, and its part bottom opens in opposite way on one side lower 27 of connector 2. On the side of the face lower 27, the wall 23 has a conical section arranged in such a way that the opening at the level of the underside 27 is smaller than the opening at level of the bottom of the U-shaped opening 21.

Le verrou 10 comprend des moyens de mise en oeuvre 11 qui se présentent ici sous la forme d'un orifice traversant 11 présentant une empreinte hexagonale. Cette empreinte hexagonale est apte à recevoir un embout hexagonal adapté d'un tournevis pour sa mise en oeuvre. D'autre part, le verrou 10 comprend sur sa paroi latérale extérieure un filetage 12 complémentaire du filetage 24 du connecteur 2 entre les branches 25 et 26 duquel il est apte à être reçu.The latch 10 comprises means of implementation 11 which appear here in the form of an orifice crossing 11 having a hexagonal imprint. This hexagonal footprint is suitable for receiving a tip hexagonal adapted from a screwdriver for its implementation. On the other hand, the latch 10 comprises on its wall lateral external thread 12 complementary to the thread 24 of connector 2 between branches 25 and 26 from which he is fit to be received.

Les moyens d'ancrage 4 se présentent ici sous la forme d'une vis pédiculaire comportant une partie d'ancrage 41 présentant un filetage osseux, surmontée d'une tête 42 qui est ici sensiblement sphérique. La tête 42 présente une première surface sphérique 43 et, formant le sommet, une seconde surface sphérique 44 dont le diamètre est inférieur au diamètre de la surface sphérique 43 mais de même centre que celle-ci. The anchoring means 4 are presented here under the shape of a pedicle screw comprising a part anchor 41 having a bone thread, surmounted a head 42 which is here substantially spherical. The head 42 has a first spherical surface 43 and, forming the apex, a second spherical surface 44 of which the diameter is less than the diameter of the surface spherical 43 but with the same center as this one.

On pourra trouver des systèmes d'ostéosynthèse similaires dans le document EP-0 613 664.We can find osteosynthesis systems similar in document EP-0 613 664.

La bague 8 est de forme annulaire et présente une première face 82 délimitant la paroi interne de la bague, une seconde face 81 délimitant la paroi externe de la bague ainsi que des bords supérieur 83 et inférieur 84 perpendiculaires à l'axe de révolution géométrique A de la bague 8. Les faces 81 et 82 sont coaxiales et préférentiellement de forme conique. Leurs génératrices respectives ne sont pas parallèles entre elles. Ainsi, les faces sont agencées l'une par rapport à l'autre de manière à ce que l'épaisseur de la bague 2 au niveau du bord supérieur 83 est supérieure à l'épaisseur de la bague 8 au niveau du bord inférieur 84. La section de la bague présente ainsi une forme de coin, donnant une forme en biseau de la bague 8. Cependant, l'une des génératrices des faces 81 et 82 peut être sensiblement parallèle à l'axe de révolution A.The ring 8 is of annular shape and has a first face 82 delimiting the internal wall of the ring, a second face 81 delimiting the external wall of the ring as well as the upper edges 83 and lower 84 perpendicular to the axis of revolution geometric A of the ring 8. The faces 81 and 82 are coaxial and preferably conical. Their respective generators are not parallel between they. Thus, the faces are arranged one with respect to the other so that the thickness of the ring 2 at the upper edge 83 is greater than the thickness of the ring 8 at the lower edge 84. The section of the ring thus presents a form of corner, giving a beveled shape of the ring 8. However, one of the generators of faces 81 and 82 can be substantially parallel to the axis of revolution AT.

Avant utilisation par un chirurgien, le connecteur 2, les moyens d'ancrage 4 ainsi que la bague 8 sont montés ensemble. La tête 42 des moyens d'ancrage est insérée au sein du logement interne 22 du connecteur 2. Puis, la bague 8 est elle-même insérée au sein du logement interne 22 du connecteur 2. Ainsi, la tête 42 des moyens d'ancrage 4 se trouve retenue prisonnière au sein du logement interne 22 à l'encontre de sa sortie par le haut, du fait de la présence au sein du logement interne 22 de la bague 8, elle-même retenue prisonnière comme on le verra plus loin. La tête 42 est retenue à l'encontre de sa sortie par le bas, du fait de la présence de la section conique de la paroi 23 du logement interne 22, qui présente une ouverture au niveau de la face inférieure 27 du connecteur 2 dont les dimensions sont inférieures au diamètre de la surface 43 de la tête 42. De plus, la bague 8 est retenue prisonnière par des moyens de retenue 28 présents au sein du logement interne 22. Ici, les moyens de retenue 28 viennent de la différence de dimension entre le logement interne 22 et l'ouverture en U 21, différence formant un rebord sur lequel vient en butée par le bas le bord supérieur 83 de la bague 8. Cet assemblage est illustré aux figures 4 et 5.Before use by a surgeon, the connector 2, the anchoring means 4 and the ring 8 are mounted together. The head 42 of the anchoring means is inserted within the internal housing 22 of connector 2. Then, the ring 8 is itself inserted within the internal housing 22 of the connector 2. Thus, the head 42 anchoring means 4 is held captive at within the internal housing 22 against its exit from above, due to the presence within the accommodation internal 22 of ring 8, itself held captive as we will see later. Head 42 is retained at against its exit from the bottom, due to the presence of the conical section of the wall 23 of the internal housing 22, which has an opening at the level of the lower face 27 of the connector 2, the dimensions are less than the diameter of the surface 43 of the head 42. In addition, the ring 8 is retained prisoner by means of restraint 28 present at the within the internal housing 22. Here, the retaining means 28 come from the difference in dimension between the internal housing 22 and the U-shaped opening 21, difference forming a rim on which abuts from below the upper edge 83 of the ring 8. This assembly is illustrated in Figures 4 and 5.

Lors de l'utilisation au cours d'une opération chirurgicale, le chirurgien met en place dans le pédicule un assemblage tel que décrit précédemment. Puis il met en place l'organe de liaison 6 en l'insérant dans l'ouverture en « U » 21 du connecteur 2. Puis il met en place le verrou 10 entre les branches 25 et 26, en mettant en prise le filetage 12 du verrou 10 avec le filetage complémentaire 24 du connecteur 2. Il met en oeuvre, par l'empreinte hexagonale 11, le verrou 10, de manière à ce que la face inférieure 13 du verrou 10 vienne en contact avec l'organe de liaison 6.
   En continuant de visser le verrou 10 entre les branches 25 et 26, le chirurgien va faire exercer un effort par le verrou 10 sur l'organe de liaison 6, ce qui va pousser l'organe de liaison 6 jusqu'à ce que ce dernier vienne en appui sur le bord supérieure 83 de la bague 8.
   Le verrouillage se poursuivant, la bague 8 glisse alors le long de la paroi 23 du logement interne 22 jusqu'à ce que la face 82 de la bague 8 vienne en contact avec la surface 43 de la tête 42 des moyens d'ancrage 4. La surface 43 est elle-même en contact avec la section conique de la paroi 23 du logement interne 22 du connecteur 2. Le système se trouve de ce fait dans une situation telle qu'illustrée à la figure 2.
   Lors du verrouillage final qui va permettre le blocage en position de l'ensemble, l'effort de serrage imposé par le chirurgien par l'intermédiaire du verrou 10 va permettre de faire glisser la bague 8 sur la tête 42. Pour cela, la face 82 va glisser sur la surface 43, obligeant la bague 8 à s'ouvrir par déformation jusqu'à ce que la face 81 de la bague 8 vienne en contact sur toute ou partie de sa surface avec la paroi 23 du logement interne 22 du connecteur 2. A ce moment, l'organe de liaison 6 vient appuyer en un point de la surface sphérique 44. Ainsi, la tête 42 est bloquée en position, d'une part par la bague 8 et d'autre part, par l'organe de liaison 6 directement. On a ainsi un appui dit trois points, deux points diamétralement opposés au contact du bord 83 de la bague 8 avec l'organe de liaison 6 et un point supplémentaire au niveau du contact de l'organe de liaison 6 avec la surface 44 de la tête 42 des moyens d'ancrage 4.During use during a surgical operation, the surgeon places an assembly in the pedicle as described above. Then he sets up the connecting member 6 by inserting it into the “U” opening 21 of the connector 2. Then he sets up the latch 10 between the arms 25 and 26, engaging the thread 12 of the latch 10 with the complementary thread 24 of the connector 2. It implements, by the hexagonal imprint 11, the latch 10, so that the lower face 13 of the latch 10 comes into contact with the connecting member 6 .
By continuing to screw the lock 10 between the arms 25 and 26, the surgeon will exert a force by the lock 10 on the connecting member 6, which will push the connecting member 6 until the latter comes to bear on the upper edge 83 of the ring 8.
As locking continues, the ring 8 then slides along the wall 23 of the internal housing 22 until the face 82 of the ring 8 comes into contact with the surface 43 of the head 42 of the anchoring means 4. The surface 43 is itself in contact with the conical section of the wall 23 of the internal housing 22 of the connector 2. The system is therefore in a situation as illustrated in FIG. 2.
During the final locking which will allow the blocking in position of the assembly, the clamping force imposed by the surgeon via the lock 10 will allow the ring 8 to slide on the head 42. For this, the face 82 will slide on the surface 43, forcing the ring 8 to open by deformation until the face 81 of the ring 8 comes into contact over all or part of its surface with the wall 23 of the internal housing 22 of the connector 2. At this moment, the connecting member 6 comes to bear at a point on the spherical surface 44. Thus, the head 42 is locked in position, on the one hand by the ring 8 and on the other hand, by the connecting member 6 directly. There is thus a support called three points, two diametrically opposite points in contact with the edge 83 of the ring 8 with the connecting member 6 and an additional point at the contact of the connecting member 6 with the surface 44 of the head 42 of the anchoring means 4.

Bien entendu, on pourra apporter à l'invention de nombreuses modifications sans sortir du cadre de celle-ci.
   Par exemple, la bague 8 pourra comporter au moins une fente.
   La fente pourra être agencée de sorte que la bague forme un anneau non fermé. Of course, many modifications can be made to the invention without departing from the scope thereof.
For example, the ring 8 may include at least one slot.
The slot can be arranged so that the ring forms an unclosed ring.

La forme en biseau due à la forme en coin de la section de la bague, au lieu d'être continue sur toute sa circonférence, pourra être constituée d'une pluralité de secteurs séparés par des fentes pour former une structure dite « en parapluie ».
   Ces différentes modifications permettent une déformation plus facile de la bague 8. Ceci a pour conséquence de faciliter l'introduction de la bague 8 au sein du logement interne 22 du connecteur 2, d'une part, et, d'autre part, le verrouillage final lors de l'utilisation en cours d'opération chirurgicale.The bevel shape due to the wedge shape of the section of the ring, instead of being continuous over its entire circumference, may consist of a plurality of sectors separated by slots to form a structure called "umbrella" .
These various modifications allow easier deformation of the ring 8. This has the consequence of facilitating the introduction of the ring 8 within the internal housing 22 of the connector 2, on the one hand, and, on the other hand, the locking final during use during surgery.

Claims (18)

Ensemble d'ostéosynthèse rachidienne (1) comprenant un connecteur (2), des moyens d'ancrage osseux (4) aptes à être reçus dans le connecteur, un organe de liaison (6) apte à être reçu dans le connecteur, et une bague (8) apte à venir en contact avec les moyens d'ancrage, caractérisé en ce qu'il est agencé de sorte que l'organe de liaison est apte à venir en appui simultanément sur la bague et les moyens d'ancrage lorsque la bague et les moyens d'ancrage sont montés dans le connecteur.Spinal osteosynthesis assembly (1) comprising a connector (2), bone anchoring means (4) able to be received in the connector, a connecting member (6) capable of being received in the connector, and a ring (8) able to come into contact with the anchoring means, characterized in that it is arranged so that the connecting member is able to come to bear simultaneously on the ring and the anchoring means when the ring and the anchoring means are mounted in the connector. Ensemble selon la revendication 1, caractérisé en ce que la bague présente au moins une face conique (81,82).Assembly according to claim 1, characterized in that the ring has at least one conical face (81,82). Ensemble selon la revendication 1 ou 2, caractérisé en ce que la bague présente une face (82) apte à venir en contact avec les moyens d'ancrage.Assembly according to claim 1 or 2, characterized in that the ring has a face (82) capable of coming into contact with the anchoring means. Ensemble selon l'une des revendications 1 à 3 caractérisé en ce que la bague présente une face (81) apte à venir en contact avec une paroi (23) du connecteur.Assembly according to one of claims 1 to 3 characterized in that the ring has a face (81) capable of coming into contact with a wall (23) of the connector. Ensemble selon les revendications 3 et 4, caractérisé en ce que les faces (81,82) sont coaxiales.Assembly according to claims 3 and 4, characterized in that the faces (81, 82) are coaxial. Ensemble selon l'une des revendications 1 à 5, caractérisé en ce que la bague présente un bord supérieur (83) plan, perpendiculaire à un axe (A) de la bague et apte à venir en contact avec l'organe de liaison.Assembly according to one of claims 1 to 5, characterized in that the ring has a planar upper edge (83), perpendicular to an axis (A) of the ring and capable of coming into contact with the connecting member. Ensemble selon l'une des revendications 1 à 6, caractérisé en ce que la bague présente un bord inférieur (84) plan et perpendiculaire à un axe (A) de la bague.Assembly according to one of claims 1 to 6, characterized in that the ring has a lower edge (84) plane and perpendicular to an axis (A) of the ring. Ensemble selon l'une des revendications 1 à 7, caractérisé en ce qu'il est agencé de sorte que la bague est apte à s'étendre entre la paroi (23) et les moyens d'ancrage lorsque l'organe de liaison réalise ledit appui.Assembly according to one of claims 1 to 7, characterized in that it is arranged so that the ring is able to extend between the wall (23) and the anchoring means when the connecting member performs said support. Ensemble selon l'une des revendications précédentes, caractérisé en ce qu'il est agencé de sorte que la bague est déformée lorsque l'organe de liaison réalise ledit appui, par référence à une forme de la bague avant montage.Assembly according to one of the preceding claims, characterized in that it is arranged so that the ring is deformed when the connecting member performs said support, with reference to a shape of the ring before mounting. Ensemble selon l'une des revendications 1 à 9, caractérisé en ce que la bague présente une épaisseur de paroi qui varie suivant une hauteur.Assembly according to one of claims 1 to 9, characterized in that the ring has a wall thickness which varies according to a height. Ensemble selon l'une des revendications précédentes, caractérisé en ce que la bague comprend une fente.Assembly according to one of the preceding claims, characterized in that the ring comprises a slot. Ensemble selon la revendication 11, caractérisé en ce que la fente est agencée de sorte que la bague forme un anneau non fermé.An assembly according to claim 11, characterized in that the slot is arranged so that the ring forms an unclosed ring. Ensemble selon la revendication 11, caractérisé en ce que la bague comprend une pluralité de fentes uniformément réparties sur une circonférence de la bague.An assembly according to claim 11, characterized in that the ring comprises a plurality of slots uniformly distributed over a circumference of the ring. Ensemble selon l'une des revendications 1 à 13, caractérisé en ce que les moyens d'ancrage comprennent une tête (42) présentant une face (43,44) sensiblement sphérique.Assembly according to one of claims 1 to 13, characterized in that the anchoring means comprise a head (42) having a substantially spherical face (43,44). Ensemble selon la revendication 14, caractérisé en ce que la tête présente des première (43) et seconde (44) faces sphériques de même centre et de diamètres sensiblement différents. Assembly according to claim 14, characterized in that the head has first (43) and second (44) spherical faces of the same center and of substantially different diameters. Ensemble selon l'une des revendications précédentes, caractérisé en ce que les moyens d'ancrage forment une vis polyaxiale.Assembly according to one of the preceding claims, characterized in that the anchoring means form a polyaxial screw. Ensemble selon l'une des revendications précédentes, caractérisé en ce qu'il comporte en outre un verrou (10) apte à venir en appui sur l'organe de liaison.Assembly according to one of the preceding claims, characterized in that it further comprises a latch (10) capable of coming to bear on the connecting member. Système d'ostéosynthèse caractérisé en ce qu'il comprend un ensemble selon l'une des revendications 1 à 16.Osteosynthesis system characterized in that it comprises an assembly according to one of claims 1 to 16.
EP02290631A 2001-03-15 2002-03-13 Spinal anchor with locking collar Expired - Lifetime EP1240875B1 (en)

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FR0103515A FR2822053B1 (en) 2001-03-15 2001-03-15 ANCHORING MEMBER WITH SAFETY RING FOR SPINAL OSTEOSYNTHESIS SYSTEM
FR0103515 2001-03-15

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EP1240875B1 EP1240875B1 (en) 2005-10-05

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EP (1) EP1240875B1 (en)
JP (1) JP4277131B2 (en)
KR (1) KR20020073439A (en)
AU (1) AU782507B2 (en)
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US7686834B2 (en) 2010-03-30
US8845695B2 (en) 2014-09-30
US8167916B2 (en) 2012-05-01
US20150012046A1 (en) 2015-01-08
US20100152778A1 (en) 2010-06-17
KR20020073439A (en) 2002-09-26
US20020133154A1 (en) 2002-09-19
US9532807B2 (en) 2017-01-03
AU2612002A (en) 2002-09-19
AU782507B2 (en) 2005-08-04
ES2246377T3 (en) 2006-02-16
JP4277131B2 (en) 2009-06-10
EP1240875B1 (en) 2005-10-05
FR2822053A1 (en) 2002-09-20
DE60206434D1 (en) 2005-11-10
US20120179206A1 (en) 2012-07-12
DE60206434T2 (en) 2006-06-29
FR2822053B1 (en) 2003-06-20
CA2377028A1 (en) 2002-09-15
JP2002315756A (en) 2002-10-29

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